如何禁止在PHP中记录某些E_WARNINGs？

Question

In my script I need to delete a file, that may or may not be there:

unlink($path);

Like the actual unlink(2), PHP's unlink() will unlink the entry, if it is there . If it is not, however, PHP will log the useless (to my purposes) message at E_WARNING level... I guess, this is nice for some people, but not for me :(

Programming in C, I could examine the errno and simply ignore the ENOENT in this case. What can one do in PHP — how to suppress the logging of this warning?

I'd rather not check for the file before trying to unlink it — doing so adds another filesystem-traversal for no reason other than cosmetics:

if (file_exists($path))
    unlink($path);

Is there a better way?

Answer 1

您可以在表达式前面加上@以仅禁止对该表达式的警告（例如@unlink($path); ）。

Answer 2

php.ini configuratioin

I agree with everyone who mentioned using "@" to suppress the error.

You can also change some of the settings in you php.ini file so that the error won't show up.

 ; Error Level Constants:
; E_ALL             - All errors and warnings (includes E_STRICT as of PHP 6.0.0)
; E_ERROR           - fatal run-time errors
; E_RECOVERABLE_ERROR  - almost fatal run-time errors
; E_WARNING         - run-time warnings (non-fatal errors)
; E_PARSE           - compile-time parse errors
; E_NOTICE          - run-time notices (these are warnings which often result
;                     from a bug in your code, but it's possible that it was
;                     intentional (e.g., using an uninitialized variable and
;                     relying on the fact it's automatically initialized to an
;                     empty string)
; E_STRICT          - run-time notices, enable to have PHP suggest changes
;                     to your code which will ensure the best interoperability
;                     and forward compatibility of your code
; E_CORE_ERROR      - fatal errors that occur during PHP's initial startup
; E_CORE_WARNING    - warnings (non-fatal errors) that occur during PHP's
;                     initial startup
; E_COMPILE_ERROR   - fatal compile-time errors
; E_COMPILE_WARNING - compile-time warnings (non-fatal errors)
; E_USER_ERROR      - user-generated error message
; E_USER_WARNING    - user-generated warning message
; E_USER_NOTICE     - user-generated notice message
; E_DEPRECATED      - warn about code that will not work in future versions
;                     of PHP
; E_USER_DEPRECATED - user-generated deprecation warnings
;
; Common Values:
;   E_ALL & ~E_NOTICE  (Show all errors, except for notices and coding standards warnings.)
;   E_ALL & ~E_NOTICE | E_STRICT  (Show all errors, except for notices)
;   E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR  (Show only errors)
;   E_ALL | E_STRICT  (Show all errors, warnings and notices including coding standards.)
; Default Value: E_ALL & ~E_NOTICE
; Development Value: E_ALL | E_STRICT
; Production Value: E_ALL & ~E_DEPRECATED
; http://php.net/error-reporting
error_reporting = E_ALL 

This final line error_reporting allows you to change exactly what errors you want to show up. In your case, the E_WARNING error is what you are trying to avoid so I would use E_ALL & ~E_WARNING .

I hope this helps.